One cell of our Citroen C-Zero is to be dying. After full charging SOC is only 53%.

I registered this damage back round 1.000km with a SOC of 95% after full charging:

My garage says traction-battery has breakdown. The car is less then 3 years old and was round 62.000km on the road. OEM warranty is 3 years or 50.000km. So the damage is not covered by OEM warranty. My garage is talking from €18.000,- for a new traction-battery as replacement part. One single cell is not available. My garage is talking to Citroen Austria if it can be handled under policy.

On dividing €18.000 / 88 cells, you get round €200,-. Minus housing, cables, BMS-modules etc. one single cell should be less then €200,-

The damage is less then €200,- for material, but you get only the whole thing around €18.000,-!

My hope now is to get one single cell via this forum. Does somebody own an i-MiEV, iOn, C-Zero for spare parts and will sell one single cell to me?

As an aside, I'm thankful for the terrific drivetrain warranty (separate from the normal 3-year/36K mile warranty) that we have in the USA which I think is a byproduct of the emissions requirements imposed on conventional vehicles. Some manufacturers try to out-do others - for example, Kia Soul EV has 10 years / 100000 miles.

Is it possible for you to talk directly with someone at Citroen corporate to see if they could accommodate you? As you are such an avid supporter of this vehicle, I would try pleading my case wherever possible.

Siai47 sold his car and all the wrecked car parts including an extra pack--haven't heard anything about who got it and what they were doing with the 2nd pack.

Over in the DIY electric car site we have seen lots of single cell failures and folks just removed or jumpered around it, and charge to a slightly lower voltage.

There is a parameter in the MUT-accessible data for the number of cells in the pack--maybe that value could be changed with the MUT device to allow operation at a lower voltage.

If not and a lev50 can't be found then maybe a '50A-hr cell' could be made using paralleled 18650 cells and wired in to the terminals of the bad cell--it doesn't have to necessarily all fit within the empty slot as there is space in the central area to stuff a few 18650s, e.g. 16 cells @ 3Ahr gets ya a 48Ahr 'cell'. If your cells are older and aged then you may even use fewer 18650s to match your pack.

But it sure seems like all the packs world-wide should have the same warranty.

Good Luck to you and please keep us posted and updated on how you solve this issue. kk

Are you sure there isn't a 5 years/100 000 km warranty on the batteries? As I have understood it, the 3 years/50 000 km warranty is drivetrain only and the battery have a 5 year warranty instead.

Citroen in Norway give 5 year warranty on everything on the car, so I am not sure what the factory warranty says, but I have seen in ads for second-hand C-Zeros imported from Europe that they say that the car has a 5 year factory warranty on the batteries and 3 years on everything else.

kiev wrote:If not and a lev50 can't be found then maybe a '50A-hr cell' could be made using paralleled 18650 cells and wired in to the terminals of the bad cell--it doesn't have to necessarily all fit within the empty slot as there is space in the central area to stuff a few 18650s, e.g. 16 cells @ 3Ahr gets ya a 48Ahr 'cell'. If your cells are older and aged then you may even use fewer 18650s to match your pack.

I think this is the best strategy, unless Citroën take it as "extended warranty" case.

As already told, my sneaking sucpicion was my trip to Melk on 30. May. The cell temps go up to 46°C.

The trips in detail:

Trip to Vienna:

Fast Charging in Vienna:

Trip to St. Pölten::

Fast Charging (20kW) in St. Pölten (with interruption):

Trip to Melk:

Trip back to Vienna:

Fast Charging in Vienna:

Trip home:

Cell temps at the end of trips at home:

I got the info from goingelectric.de forum, that Mitsubishi also changes single cells in the meantime. So i contacted Mitsubishi Austria.

In the meantime i talked to a technician from Mitsubishi Austria. In his opinion the cell temps were not the problem. 60°C up are a problem for the cells, but the BMS will reduce current as before. He knows already some cases with defective cells, but Mitsubishi has a warranty of 5 years and 100.000km in Austria/Europe and so till now always the whole pack was changed within warranty. The whole pack gone back to the OEM for analysis purpose.

Mitsubishi Austria offers the whole pack for €10.000. You can get also a 4er- or 8er-block in the meantime. You can choose between high/medium/low Ah-values for this replacment block for best fitting to your existing cells (so cell balancing of BMS can do his job as well as before). All seals for the package are also replaced and after reassembling the pack, there is be done a leakage test. But this all is theorie - Mitsubishi Austria has never done a block-replacement till now.

Another guy, who has a lot of expirience in EVs, assumes a defective BMS-modul rather then a defective cell. In his expirience the Yuasa cells are very good and 60.000km is no challenge for them.

So it's looking much more complicated, as i thought first.

Maybe Citroen Austria is handling this under policy. On Tuesday i'll get new informations.

I have done now an analyses of my caniOn database, beginning at 30. May regarding cell voltages, cell temps and SoC. Therefore i compared cell 23 with cell 1.

First abnormality i see at 10. June. There are 20mV diff in cell voltage the first time.

Cell temps drop down since 30. May:

On 19. June i observed the first none 100% SoC after full charging over night. All charging before unequally 100% were fast chargings. All full charging after 19. June were regulary full trys over night with falling trend to 49% yesterday: